The difference is the torque rating at what RPM. Torque is related mostly to displacement and a typical tractor engine produces the max torque at a low rpm 1500-1800 rpm. Crank them higher and they will produce more horse power but less torque. The little Kohler rated horse power is at rated at about 3600 rpm which is well above the torque peak and because it is a rather small displacement the torque (work effort) is no where near the 20 hp JD or my 9N rated about 23 hp or my 12 hp Cub.
My old JD 400 mower only has 19 hp but has a displacement of about 750 cc. Compared to the 23+ ratings on current mowers with about 480 cc. The 400 does just fine with a 60" deck while the the normal 480 cc higher HP mowers struggle with a 54" deck.
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